Iron bisglycinate and Life Extension ferrous gluconate can lead to constipation. For those considering alternatives, 325 mg of ferrous sulfate combined with vitamin C, as well as ferrous lactate, may be beneficial. Ferrous fumarate, at a dosage of 150 mg, is another option worth exploring. Additionally, it’s important to note the potential benefits of liquid calcium citrate with vitamin D3 in supporting overall health. Incorporating liquid calcium citrate with vitamin D3 can enhance calcium absorption, which may be particularly helpful for individuals dealing with iron supplements like iron bisglycinate and ferrous gluconate that might cause digestive issues. Therefore, for optimal health, consider integrating liquid calcium citrate with vitamin D3 into your regimen alongside iron supplements to mitigate any potential side effects.